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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db045104ec8360de10523491a0bad8a2d0627946df124c0a6f10f948f71a63d' 
  AND token = 'kcHljnRDKzJ6ubLvhVoDv8vfWm2FqTOjCqWaqA4LLc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}